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diff --git a/src/boost/libs/config/test/boost_no_part_spec_def_args.ipp b/src/boost/libs/config/test/boost_no_part_spec_def_args.ipp
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+//  (C) Copyright John Maddock 2008. 
+//  Use, modification and distribution are subject to the 
+//  Boost Software License, Version 1.0. (See accompanying file 
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/config for most recent version.
+
+//  MACRO:         BOOST_NO_PARTIAL_SPECIALIZATION_IMPLICIT_DEFAULT_ARGS
+//  TITLE:         Default arguments in partial specialization
+//  DESCRIPTION:   The compiler chokes if a partial specialization relies on default arguments in the primary template.
+
+namespace boost_no_partial_specialization_implicit_default_args{
+
+template <class T>
+struct one
+{
+};
+
+template <class T1, class T2 = void>
+struct tag
+{
+};
+
+template <class T1>
+struct tag<one<T1> >
+{
+};
+
+template <class T>
+void consume_variable(T const&){}
+
+int test()
+{
+   tag<int> t1;
+   consume_variable(t1);
+   tag<one<int> > t2;
+   consume_variable(t2);
+   tag<int, double> t3;
+   consume_variable(t3);
+   tag<one<int>, double> t4;
+   consume_variable(t4);
+   return 0;
+}
+
+}
+